So far, though, the price has been up and down, in part because of anticipation of the outcome of a summit this week, which may result in a new round of quantitative easing, which would likely drive down the value of the dollar.

Japan is expected to pass a renewable energy bill that would introduce a feed-in tariff to make renewables more attractive, and set down in law the government’s target of cutting greenhouse gas emissions 25 percent (compared with 1990 levels) by 2020. To cope with the Fukushima disaster, though, Japan has boosted its use of fossil fuels in the short term.

Germany’s national rail company, which is the country’s biggest electricity consumer, is also moving toward renewables, planning to quit fossil fuels by 2050.

The Billionth Car

The future is bright for electric cars, according to a forecast from Pike Research, which said worldwide sales are likely to grow to 5.2 million by 2017, more than 50 times this year’s estimated sales.

Another researcher came under fire after the “Climategate” leak of e-mails. He was cleared earlier this year in an investigation by his university, and now has been cleared in a second investigation by the National Science Foundation.